Posted by 36F30 on March 01, 2011 at 10:25:09 from (71.214.217.123):
In Reply to: Dot Bolts posted by dansuper27 on March 01, 2011 at 09:06:33:
The boys on the cow board had a thread on the dot bolts and came up with early 36 I believe as to when IH started using them. None of the square head bolts have dot heads, Many square bolts on the F series. Bolts holding on the drop boxes although hex heads were special shoulder bolts and not dot headed and I have found the bolts holding the bellhousing to the block don't have dots. Later tractors seem to have them scattered randomly around. The bolts were made by IH before the SAE grading system was adopted. I CAN ONLY ASSUME the engineers at IH set the standards on the capacity or grade of the bolts. I do know that many of these fasteners come out very easily after being in place for 75 to 80 years so they must be very well made.
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